diff --git a/doc/.gitignore b/doc/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..ee0fa6e3fbe5cab526e9a9a846dc41d99d6ad6a7
--- /dev/null
+++ b/doc/.gitignore
@@ -0,0 +1,2 @@
+*converted-to*pdf
+out
diff --git a/doc/expansion-notes.pdf b/doc/expansion-notes.pdf
index 32166e172ae9cf06e9d255f383fcfb5dca35fad5..5e202317829ffcf7fbfc61350313b15bf7cc0463 100644
Binary files a/doc/expansion-notes.pdf and b/doc/expansion-notes.pdf differ
diff --git a/doc/expansion-notes.tex b/doc/expansion-notes.tex
index 35ace5aee91c1c52d986ff7a4075a630496cda68..ebbe38a3953470a7ea91dc3d2dfd973a435eb54c 100644
--- a/doc/expansion-notes.tex
+++ b/doc/expansion-notes.tex
@@ -108,6 +108,6 @@ The translated coefficients satisfy
 %
 \[ H_k^{(1)}(|s - c_2|) e^{i k \theta_{sc_2}} = (-1)^k \sum_{l = -\infty}^{\infty}
 \underbrace{J_l(|s - c_1|) e^{- i l \theta_{sc_1}}}_{\textrm{old coefficients}}
-H_{k + l}^{(1)}(|c_1 - c_2|) e^{(k + l)\theta_{c_2c_1}}. \]
+H_{k + l}^{(1)}(|c_1 - c_2|) e^{i(k + l)\theta_{c_2c_1}}. \]
 
 \end{document}