diff --git a/notebooks/manual/FloatsReals.ipynb b/notebooks/manual/FloatsReals.ipynb
index 41dc6e1ca0ae19eff686317d2af8f2dcdd9338a5..90e15ffb733bd26a3af0c6b9ed4181e19f165966 100644
--- a/notebooks/manual/FloatsReals.ipynb
+++ b/notebooks/manual/FloatsReals.ipynb
@@ -786,7 +786,24 @@
    "cell_type": "markdown",
    "id": "cc7e1768",
    "metadata": {},
-   "source": []
+   "source": [
+    "## Event-B Theories\n",
+    "Event-B does not have support for reals or floats as basic type but one can use the theory plugin.\n",
+    "\n",
+    "[https://prob.hhu.de/w/index.php?title=Event-B_Theories]\n",
+    "\n",
+    "To be able to view reals in ProB within Rodin you need to install a recent nightly build: [https://www3.hhu.de/stups/rodin/prob1/nightly]\n",
+    "\n",
+    "You need to use one of the standard theories.\n",
+    "\n",
+    "To write your own theory you should add an axiomatic type called REAL, FLOAT or the unicode R for reals.\n",
+    "Then you have to define axiomatic operators and link them to ProB's real operators.\n",
+    "You can do this either\n",
+    "* using a theory mapping file (.ptm extension) which needs to be put into the Rodin project, see [https://prob.hhu.de/w/index.php?title=Event-B_Theories]\n",
+    "* or use the same name as the external functions above (e.g., RSQRT); in this way ProB will do the mapping automatically.\n",
+    "\n",
+    "\n"
+   ]
   }
  ],
  "metadata": {