diff --git a/src/bindgen/ir/documentation.rs b/src/bindgen/ir/documentation.rs
index 8d5fcb6..6822c0e 100644
--- a/src/bindgen/ir/documentation.rs
+++ b/src/bindgen/ir/documentation.rs
@@ -43,9 +43,14 @@ impl Source for Documentation {
             return;
         }
 
+        let end = match config.documentation_length {
+            DocumentationLength::Short => 1,
+            DocumentationLength::Full => self.doc_comment.len(),
+        };
+
         // Cython uses Python-style comments, so `documentation_style` is not relevant.
         if config.language == Language::Cython {
-            for line in &self.doc_comment {
+            for line in &self.doc_comment[..end] {
                 write!(out, "#{}", line);
                 out.new_line();
             }
@@ -76,11 +81,6 @@ impl Source for Documentation {
             _ => (),
         }
 
-        let end = match config.documentation_length {
-            DocumentationLength::Short => 1,
-            DocumentationLength::Full => self.doc_comment.len(),
-        };
-
         for line in &self.doc_comment[..end] {
             match style {
                 DocumentationStyle::C => out.write(""),
diff --git a/tests/expectations/doclength_short.pyx b/tests/expectations/doclength_short.pyx
index 72bf956..ea2838e 100644
--- a/tests/expectations/doclength_short.pyx
+++ b/tests/expectations/doclength_short.pyx
@@ -7,14 +7,7 @@ cdef extern from *:
 cdef extern from *:
 
   # The root of all evil.
-  #
-  # But at least it contains some more documentation as someone would expect
-  # from a simple test case like this. Though, this shouldn't appear in the
-  # output.
   void root();
 
   # A little above the root, and a lot more visible, with a run-on sentence
-  # to test going over the first line.
-  #
-  # Still not here, though.
   void trunk();