add missing "if"

diff --git a/Doc/lib/libfileinput.tex b/Doc/lib/libfileinput.tex
index c66501f21ddf762c41845b9d0fe0cd58e6fd576f..cd20f99f1ed8501f0148957a354d567b2474789e 100644 (file)
--- a/Doc/lib/libfileinput.tex
+++ b/Doc/lib/libfileinput.tex
@@ -77,7 +77,7 @@ The following functions use the global state created by
 \end{funcdesc}
 
 \begin{funcdesc}{isfirstline}{}
-  Returns true the line just read is the first line of its file,
+  Returns true if the line just read is the first line of its file,
   otherwise returns false.
 \end{funcdesc}