diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
index 3f1cb7b172eb..ce9797e11b90 100644
--- a/lib/matplotlib/backends/backend_pgf.py
+++ b/lib/matplotlib/backends/backend_pgf.py
@@ -777,6 +777,10 @@ def _print_pgf_to_fh(self, fh, *, bbox_inches_restore=None):
%% Make sure the required packages are loaded in your preamble
%% \\usepackage{pgf}
%%
+%% Also ensure that all the required font packages are loaded; for instance,
+%% the lmodern package is sometimes necessary when using math font.
+%% \\usepackage{lmodern}
+%%
%% Figures using additional raster images can only be included by \\input if
%% they are in the same directory as the main LaTeX file. For loading figures
%% from other directories you can use the `import` package
diff --git a/tutorials/text/pgf.py b/tutorials/text/pgf.py
index 6f958efe03fc..caedf394f359 100644
--- a/tutorials/text/pgf.py
+++ b/tutorials/text/pgf.py
@@ -187,6 +187,12 @@
using either the ``rasterized=True`` keyword, or ``.set_rasterized(True)`` as
per :doc:`this example `.
+* Various math fonts are compiled and rendered only if corresponding font
+ packages are loaded. Specifically, when using ``\mathbf{}`` on Greek letters,
+ the default computer modern font may not contain them, in which case the
+ letter is not rendered. In such scenarios, the ``lmodern`` package should be
+ loaded.
+
* If you still need help, please see :ref:`reporting-problems`
.. _LaTeX: http://www.tug.org
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