diff --git a/jl-cours/environments.tex b/jl-cours/environments.tex
index 73faef7..dc4f426 100644
--- a/jl-cours/environments.tex
+++ b/jl-cours/environments.tex
@@ -71,6 +71,39 @@
   }
 }
 
+% corollaire
+\NewDocumentEnvironment{corollaire}{ s o }{
+  \IfBooleanTF {#1} {
+    % if starred: with logo
+    \IfNoValueTF {#2} {
+      % if no subtitle
+      \begin{@coro1}
+
+    }{
+      % if subtitle
+      \begin{@coro1}[#2]
+
+    }
+  }{
+    % if not starred: without logo
+    \IfNoValueTF {#2} {
+      % if no subtitle
+      \begin{@coro2}
+
+    }{
+      % if subtitle
+      \begin{@coro2}[#2]
+
+    }
+  }
+}{
+  \IfBooleanTF {#1} {
+    \end{@coro1}
+  }{
+    \end{@coro2}
+  }
+}
+
 % propriete
 \NewDocumentEnvironment{propriete}{ s o }{
   \IfBooleanTF {#1} {
diff --git a/jl-cours/mdtheorem.tex b/jl-cours/mdtheorem.tex
index e1b1e93..3148b2b 100644
--- a/jl-cours/mdtheorem.tex
+++ b/jl-cours/mdtheorem.tex
@@ -64,6 +64,26 @@
   \end{@thm2*}
 }
 
+\RenewDocumentEnvironment{@coro1}{ o } {%begin
+  \IfNoValueTF {#1} {
+    \begin{@coro1*}
+  }{
+    \begin{@coro1*}[\hfill{\normalfont\slshape#1}]
+  }
+}{%end
+  \end{@coro1*}
+}
+
+\RenewDocumentEnvironment{@coro2}{ o } {%begin
+  \IfNoValueTF {#1} {
+    \begin{@coro2*}
+  }{
+    \begin{@coro2*}[\hfill{\normalfont\slshape#1}]
+  }
+}{%end
+  \end{@coro2*}
+}
+
 % propriete
 \mdtheorem[style=pencil, theoremseparator={}, theoremspace={},
            outerlinewidth=1pt, outerlinecolor=black]{@ppt1}{\Jd Propriété}