diff --git a/README.rst b/README.rst
index abab13eb..3a77b607 100644
--- a/README.rst
+++ b/README.rst
@@ -35,7 +35,7 @@
 .. |Tracking| image:: https://img.shields.io/badge/issue_tracking-github-blue
         :target: https://github.com/diffpy/diffpy.morph/issues
 
-Python package for manipulating and comparing diffraction data
+Python package for manipulating and comparing diffraction data.
 
 ``diffpy.morph`` is a Python software package designed to increase the insight
 researchers can obtain from measured data including diffraction data
diff --git a/docs/source/index.rst b/docs/source/index.rst
index eb981226..59936edd 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -2,7 +2,7 @@
 diffpy.morph documentation
 ##########################
 
-``diffpy.morph`` - Tools for manipulating and comparing PDF profiles
+``diffpy.morph`` - Tools for manipulating and comparing 1D signals.
 
 | Software version |release|
 | Last updated |today|.
diff --git a/news/save_pdf.rst b/news/save_pdf.rst
new file mode 100644
index 00000000..b01e6998
--- /dev/null
+++ b/news/save_pdf.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* Default labels for saving are now [x] and [fx] instead of [r] and [gr].
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>
diff --git a/src/diffpy/morph/__init__.py b/src/diffpy/morph/__init__.py
index 48455828..c2baddb1 100644
--- a/src/diffpy/morph/__init__.py
+++ b/src/diffpy/morph/__init__.py
@@ -12,7 +12,7 @@
 # See LICENSE.rst for license information.
 #
 ##############################################################################
-"""Python package for manipulating and comparing PDF profiles."""
+"""Python package for manipulating and comparing 1D signals."""
 
 # key used when saving multiple morphs
 __save_morph_as__ = "save_morph_as"
diff --git a/src/diffpy/morph/morph_io.py b/src/diffpy/morph/morph_io.py
index b0d80b68..cf194f54 100644
--- a/src/diffpy/morph/morph_io.py
+++ b/src/diffpy/morph/morph_io.py
@@ -223,7 +223,7 @@ def single_morph_output(
             path_name = "NO FILE PATH PROVIDED"
         else:
             path_name = str(Path(morph_file).resolve())
-        header = "# PDF created by diffpy.morph\n"
+        header = "# Function created by diffpy.morph\n"
         header += f"# from {path_name}"
 
         header_verbose = f"{morphs_in}\n{morphs_out}"
@@ -236,7 +236,7 @@ def single_morph_output(
                     print(header_verbose, file=outfile)
 
                 # Print table with label
-                print("\n# Labels: [r] [gr]", file=outfile)
+                print("\n# Labels: [x] [fx]", file=outfile)
                 numpy.savetxt(outfile, numpy.transpose(xy_out))
 
             if stdout_flag:
@@ -246,7 +246,7 @@ def single_morph_output(
 
         else:
             # Just print table with label if save is to stdout
-            print("# Labels: [r] [gr]")
+            print("# Labels: [x] [fx]")
             numpy.savetxt(sys.stdout, numpy.transpose(xy_out))
 
 
diff --git a/tests/testdata/funcy_target.cgr b/tests/testdata/funcy_target.cgr
index fa36dc6b..108fde4d 100644
--- a/tests/testdata/funcy_target.cgr
+++ b/tests/testdata/funcy_target.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from NO FILE PATH PROVIDED
 
 # Input morphing parameters:
@@ -32,7 +32,7 @@ def quadratic(x, y, a0, a1, a2):
 # Rw = 0.000000
 # Pearson = 1.000000
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 1.000000000000000000e+00
 1.000000000000000056e-01 1.229999999999999982e+00
 2.000000000000000111e-01 1.520000000000000018e+00
diff --git a/tests/testdata/squeeze_morph.cgr b/tests/testdata/squeeze_morph.cgr
index cc7799b9..ee388096 100644
--- a/tests/testdata/squeeze_morph.cgr
+++ b/tests/testdata/squeeze_morph.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000056e-01 2.016607210740701817e-01
 2.000000000000000111e-01 4.012816425967311584e-01
diff --git a/tests/testdata/squeeze_target.cgr b/tests/testdata/squeeze_target.cgr
index 1474409a..e5ab4504 100644
--- a/tests/testdata/squeeze_target.cgr
+++ b/tests/testdata/squeeze_target.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -24,7 +24,7 @@
 # Rw = 0.000000
 # Pearson = 1.000000
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 -8.357788796904224253e-08
 1.000000000000000056e-01 9.983335989539958433e-02
 2.000000000000000111e-01 1.986692882755068390e-01
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_a.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_a.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_a.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_a.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_b.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_b.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_b.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_b.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_c.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_c.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_c.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_c.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_d.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_d.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_d.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_d.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_e.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_e.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_e.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_e.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_f.cgr b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_f.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_f.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/Morphs/mwt_f.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/succinct/single_succinct_morph.cgr b/tests/testdata/testsequence/testsaving/succinct/single_succinct_morph.cgr
index c1b2cb4c..041f42fa 100644
--- a/tests/testdata/testsequence/testsaving/succinct/single_succinct_morph.cgr
+++ b/tests/testdata/testsequence/testsaving/succinct/single_succinct_morph.cgr
@@ -1,7 +1,7 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_a.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_a.cgr
index 95cba1f9..eed0c27f 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_a.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_a.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.127100
 # Pearson = 0.992111
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_b.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_b.cgr
index ef8cf023..a41aa616 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_b.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_b.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.117595
 # Pearson = 0.993160
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_c.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_c.cgr
index 27ebcd00..c53e08c6 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_c.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_c.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.105918
 # Pearson = 0.994409
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_d.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_d.cgr
index 8a30b321..d77b671d 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_d.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_d.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.062392
 # Pearson = 0.998077
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_e.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_e.cgr
index 1ad1a45f..b4d00115 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_e.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_e.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.034859
 # Pearson = 0.999424
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_f.cgr b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_f.cgr
index 32ce202b..8e8aa722 100644
--- a/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_f.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/Morphs/mwt_f.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.020141
 # Pearson = 0.999810
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04
diff --git a/tests/testdata/testsequence/testsaving/verbose/single_verbose_morph.cgr b/tests/testdata/testsequence/testsaving/verbose/single_verbose_morph.cgr
index 95cba1f9..eed0c27f 100644
--- a/tests/testdata/testsequence/testsaving/verbose/single_verbose_morph.cgr
+++ b/tests/testdata/testsequence/testsaving/verbose/single_verbose_morph.cgr
@@ -1,4 +1,4 @@
-# PDF created by diffpy.morph
+# Function created by diffpy.morph
 # from PATH
 
 # Input morphing parameters:
@@ -15,7 +15,7 @@
 # Rw = 0.127100
 # Pearson = 0.992111
 
-# Labels: [r] [gr]
+# Labels: [x] [fx]
 0.000000000000000000e+00 0.000000000000000000e+00
 1.000000000000000021e-02 4.042510000000000027e-04
 2.000000000000000042e-02 7.817419999999999838e-04