diff --git a/docs/source/capi/index.rst b/docs/source/capi/index.rst
index f47d7065a0..e924aa6e2a 100644
--- a/docs/source/capi/index.rst
+++ b/docs/source/capi/index.rst
@@ -51,13 +51,13 @@ Functions
    .. doxygenfile:: capi.h
    to populate this documentation without using
    .. doxygenfunction::
-   for every functions.
+   for every function.
 
 .. doxygenfunction:: openmc_calculate_volumes
 
 .. doxygenfunction:: openmc_cell_get_fill
 
-.. doxygenfunction:: int openmc_cell_get_id
+.. doxygenfunction:: openmc_cell_get_id
 
 .. doxygenfunction:: openmc_cell_get_temperature