diff --git a/R.gitignore b/R.gitignore
index 60e037a..fcff087 100644
--- a/R.gitignore
+++ b/R.gitignore
@@ -1,25 +1,33 @@
 # History files
 .Rhistory
 .Rapp.history
 
 # Session Data files
 .RData
 
 # Example code in package build process
 *-Ex.R
 
 # Output files from R CMD build
 /*.tar.gz
 
 # Output files from R CMD check
 /*.Rcheck/
 
 # RStudio files
 .Rproj.user/
 
 # produced vignettes
 vignettes/*.html
 vignettes/*.pdf
 
 # OAuth2 token, see https://github.com/hadley/httr/releases/tag/v0.3
 .httr-oauth
+
+# knitr and R markdown default cache directories
+/*_cache/
+/cache/
+
+# Temporary files created by R markdown
+*.utf8.md
+*.knit.md